UmbrianPronunciation: /ˈʌmbrɪən/Definition of Umbrian adjective relating to Umbria, its people, or their languages. noun 1a native or inhabitant of Umbria, especially in pre-Roman times. 2 [mass noun] an extinct Italic language of central Italy, related to Oscan and surviving in inscriptions mainly of the 2nd and 1st centuries bc. Umbrian in other Oxford dictionaries Definition of Umbrian in the US English dictionary